Mako - just an FYI, Paeco's built engines don't nearly produce that much power. They take a factor and multiply it to get the "crank" hp. It's just ricemath.
You will also have to be curious as to how they get their ratings. If their "320hp beast" is true, their "complete" engine would have to include either 4-440CC injectors as well as programmable ECU.
When it comes to looking at gains in the Paeco catalog, you should really take it with a grain of salt.